One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,8,10)(7,9,11,12)(13,14)(15,23)(16,24)(17,27)(18,21)(19,22)(20,25)(26,28)(1,2)(3,4)(5,7)(6,9)(8,11)(10,12)(13,15,16,17,19,26,18,25)(14,20,21,28,22,27,24,23)(6,10)(7,11)(13,16,19,18)(14,21,22,24)(15,25,26,17)(20,23,27,28)(2,4)(6,10)(9,12)(14,22)(15,26)(17,25)(21,24) involution — undirected(13,17,16,26,19,25,18,15)(14,23,21,20,22,28,24,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.